USB connection problem with iPhone

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2015年初 MacBook Air 13"

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Janos Bata @janikukac

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发帖于: 2017年10月23日

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USB connection problem with iPhone

Hi everybody,

I have a MacBook Air Early 2015 and an iPhone 5s.

When I plug my iPhone into system my iPhone oscillates connecting and disconnecting rapidly.

I did almost everything: changed the cable, cleaned the dock, SMC, NVRAM reset, iTunes reinstall, iPhone's hard reset and restore privacy settings, even did a clean Mac OS install but nothing changes.

With pen drives, MIDI controllers etc... the USB works properly, and it does with my iPhone if I do not log-in into my Mac, just turning it on and plug the USB in. In that case there is no disconnect/reconnect cycling problem. But, immediately after I log-in it starts up.

I was in two different Apple Service and they said that is something software problem and possibly, a clean Mac reinstall solves it. It did not solved it! I tried to connect my iPhone into other notebooks, there were no problem.

Any idea? (Sorry for my poor English...) And yes, the cable is original.

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What is the MacOS version you are running presently and did you have any issues with your system before? Did it get wet or have something spilled into it?

由 Dan 完成的 2017年10月23日

Also, is the cable you are now using an original Apple cable? Some third-party ones don't allow enough power through and therefore demonstrate this problem.

由 [deleted] 完成的 2017年10月24日

Thanks for the answers!

I am running MacOS High Sierra at the moment, but before the update, Sierra did the same thing... I have no other issues before and Mac never got any wet.

The cable is absolutely original, I tried a few other cables too, and bought a new one just because of that symptom. I read a lot about that problem on the internet, many other users all around the World has the same problem but no one has the solution. (not just with iPhones, some iPads do the same thing...)

由 Janos Bata 完成的 2017年10月24日

Same problem here, iPad and iPhone cycling power on / off ! what to do ??

由 adt888 完成的 2018年6月20日

lots of people have this problem; it the Apple's fault not user error

由 Joe Filter 完成的 2019年4月26日

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Dan @danj

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At this point I’m suspecting the system has a USB power issue. These are getting hard to find but I think it’s what you need to test things out: USB Charger Doctor - Current & Voltage Charging Detector as well as Battery Voltmeter & Ammeter. With it you should be able to compare the current draw on a second working system (ideally another MacBook Air of the same series) and yours to see if the voltage and/or current draw is the issue. You might want to also try a second iPhone (again the same series would be best comparison).

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Yeah, I agree that. I have the same opinion, and I said that to the service 2-3 weeks before... But they answered that it can be just a software problem... Shameful...

由 Janos Bata 完成的 2017年10月24日

I had the same problem with my previous macbook air.

Now i lost my old macbook air and got a new one 2 weeks ago, same problem exist. not just my iphone, but also my wife's iphone. Hence, i strongly believe it's the problem of macbook airs.

by the way, i don't buy cables except from apple authorised reseller, i'm certain they're not 3rd party..

previously when i went to the service centre, they say it might be the USB port on my macbook air had wear & tear effect, & repair would cost a lot. But now this new one i bought having the same problem, i am sure it's a problem of macbook air... can anyone in apple try to address this issue and fix this?

由 furoice88 完成的 2018年4月25日

furoice88 - Is this a brand new, refurb'ed or used system?

Apple does not officially monitor this site so asking Apple for help here won't help you.

The best you can do is bring the MacBook Air back to where you bought it with your iPhone's and cables to show them.

Frankly I would do some tests using the USB Charger Doctor I pointed out above before going.

由 Dan 完成的 2018年4月25日

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What is the MacOS version you are running presently and did you have any issues with your system before? Did it get wet or have something spilled into it? — Dan
Also, is the cable you are now using an original Apple cable? Some third-party ones don't allow enough power through and therefore demonstrate this problem. — [deleted]
Thanks for the answers!

I am running MacOS High Sierra at the moment, but before the update, Sierra did the same thing... I have no other issues before and Mac never got any wet.

The cable is absolutely original, I tried a few other cables too, and bought a new one just because of that symptom. I read a lot about that problem on the internet, many other users all around the World has the same problem but no one has the solution. (not just with iPhones, some iPads do the same thing...) — Janos Bata
Same problem here, iPad and iPhone cycling power on / off ! what to do ?? — adt888
lots of people have this problem; it the Apple's fault not user error — Joe Filter
Yeah, I agree that. I have the same opinion, and I said that to the service 2-3 weeks before... But they answered that it can be just a software problem... Shameful... — Janos Bata
I had the same problem with my previous macbook air.

Now i lost my old macbook air and got a new one 2 weeks ago, same problem exist. not just my iphone, but also my wife's iphone. Hence, i strongly believe it's the problem of macbook airs.

by the way, i don't buy cables except from apple authorised reseller, i'm certain they're not 3rd party..

previously when i went to the service centre, they say it might be the USB port on my macbook air had wear & tear effect, & repair would cost a lot. But now this new one i bought having the same problem, i am sure it's a problem of macbook air... can anyone in apple try to address this issue and fix this? — furoice88
furoice88 - Is this a brand new, refurb'ed or used system?

Apple does not officially monitor this site so asking Apple for help here won't help you.

The best you can do is bring the MacBook Air back to where you bought it with your iPhone's and cables to show them.

Frankly I would do some tests using the USB Charger Doctor I pointed out above before going. — Dan

Craig Clifford @craigclifford 声誉积分: 1千 1 1 1 · Answer 1 · 2019-02-23T19:06:45-07:00

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Craig Clifford @craigclifford

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发帖于: 2019年2月23日

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I was able to fix the issue by restarting the USB service.

sudo killall -STOP -c usbd

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Thanks, I hope this will be helpful for peoples who are on the same boat. Unfortunately I sold my MBA, so I can't try it. :(

由 janikukac 完成的 2019年2月24日

Great solution!

由 Lucas León 完成的 2019年3月14日

Thanks, Man!! Finally got it working.

由 daner06 完成的 2019年4月3日

Are you serious, is it this easy? Yes it working %#*@... took me 1,5 years of searching

由 stalkerrr 完成的 2019年4月25日

Worked for me yay

由 Akinwande Ayodeji A 完成的 2019年5月3日

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Sayed Zamir Hashemi @sayedzamir37869 声誉积分: 85 2 2 · Answer 2 · 2019-09-01T10:21:26-07:00

Sayed Zamir Hashemi @sayedzamir37869

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This command solved my problem. However, I would suggest that for those with little knowledge of Mac, please do the following steps:

1- Go to Application

2- Go to utilities

3- Go to Terminal

4- copy and paste this command in full : sudo killall -STOP -c usbd

5- press Enter

6- It will prompt you for your password, and type your password and hit enter

7- connect your iPhone to mac

8- The problem should be resolved

Best of luck

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thanks Sayed Zamir , this helpt me :) , sudo killall -STOP -c usbd

由 Amaal Zohny 完成的 2019年10月3日

Omg Sayed, you are an absolute lifesaver. Thank you!

由 jessica_espinoza_1991 完成的 2019年10月7日

Thank you! This worked for me as well!

由 FolabiQFilms 完成的 2019年10月14日

YES YES YES! Thank you, you computer wizard!! @Sayed Zamir Hashemi

由 Henry Reily-Collins 完成的 2019年10月18日

Thank you so much Sayed . You really helped me with this, this issue was been troubling me for sooo long.

All thanks to you. :) @Sayed Zamir Hashemi

由 Vamsee 完成的 2019年10月21日

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Chukwukere Chijioke @ceeerock 声誉积分: 1 4 1 · Answer 3 · 2018-09-24T20:38:48-07:00

Chukwukere Chijioke @ceeerock

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I had the same problem. The problem is caused by cache and directory issues with the startup disk. BOOTING IN SAFE MODE SOLVED IT. Boot in safe mode (hold down shift key immediately you power the macbook, keep holding it until you see the login screen). To confirm that you are in safe mode (safe mode should be written in red at the top right corner of the login screen). Login, plug in your iphone and the problem is solved. To confirm that the problem is solved, leave safe mode by just restarting the macbook normally (without holding shift). Sorry for the late response. THIS IS A 100% FIX

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You save my life

由 sơn hoàng 完成的 2018年10月29日

I can not solved my problem. When i restart my Macbook, problem is not solved. :(

由 MoCoRo Channel 完成的 2018年11月13日

The safe mode thing solved the problem right now.

由 barunindoto 完成的 2019年7月4日

Not only did it not work, my USB ports don't work at all in safe mode. Less than 100% fix.

由 Jeff 完成的 2019年12月4日

Worked like a charm for me too!

由 Devender Singh 完成的 2020年11月20日

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leuboutique017 @leuboutique017 声誉积分: 1 · Answer 4 · 2019-07-23T07:52:02-07:00

leuboutique017 @leuboutique017

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i have the same problem but a non-Apple lightning cable worked for me! original apple cable won’t stop disconnecting.

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Now here I am: I found a guy, who had the same problem 2 years before. He said that nothing helped him but then he bought a non-Apple lightning cable (ISY IUC-500 type) and it solved everything. I am a little bit skeptic and don't know yet where can I buy that cable but I think it is worth a try.

由 Janos Bata 完成的 2017年10月25日

I would find it hard to believe a 3rd party cable would be better than an Apple cable (both being new). The length of the cable could be a factor as an example an overly long cable or one which has a USB extension would have a voltage drop which could explain why your iPhone is having problems as your system is on the edge.

由 Dan 完成的 2017年10月25日

I have an 1 m long lightning cable...

由 Janos Bata 完成的 2017年10月26日

Don't think thats overly long ;-} A 2 m cable with an extension would be.

由 Dan 完成的 2017年10月26日

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Alex McNeal @alexmcneal 声誉积分: 1 1 · Answer 5 · 2019-08-15T11:33:12-07:00

Alex McNeal @alexmcneal

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发帖于: 2019年8月15日

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This post is pretty old but I was about to buy the USB charge doctor to check mine but a coworker suggested I try resetting the SMC on my mac and that fixed it in less than 5 mins. So anyone that’s still dealing with this should try that before buying something to check their USB ports. Here are instructions.

http://osxdaily.com/2010/03/24/when-and-...

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